Stereoselective synthesis of .gamma.,.delta.-epoxy-.beta.-methyl-.gamma.-(trimethylsilyl)alkanols. Synthesis of the C(1)-C(7) segment of 6-deoxyerythronolide B
[2,3]Wittigrearrangement of 2′-heterosubstituted alkenyloxyacetic acid esters exhibited ,-selectivity, which can be attributed to the interaction between the nonbonding orbital on the ether oxygen atom and the -bonding orbital of carbonheteroatom bond.